@article{53446,
      author = {Colbert, Edwin H.},
      url = {http://library.usi.edu/record/53446},
      title = {Evolution of the vertebrates; a history of the backboned  animals through time},
      publisher = {Wiley},
      recid = {53446},
      pages = {xvi, 535 p.},
      address = {New York,},
      year = {1969},
}